(c) How big does the return have to be to put a domestic stock fund in the top 20% for the three-year period? Another way to think about this question is in terms of probability instead of percentage. To have a domestic stock fund in the top 20% means that 80% of domestic stock funds will be less than some value. First convert 80% to a probability. probability- percentage 100% 100% % Here, we are working backwards to find a return such that if new large-cap domestic stock fund was randomly selected the probability the new fund has a return less than this value is